Configurazione Multisito con Docker

:warning: Sebbene il multisito sia supportato nell’applicazione Discourse, questa è una configurazione avanzata per amministratori di sistema. Se non sai cosa stai facendo, non configurare il multisito. Il team di Discourse non è in grado di fornire supporto per la configurazione multisito.

Se desideri ospitare più domini su un’unica configurazione Docker, avrai bisogno di una configurazione multisito. Ecco i blocchi di base per una.

Comprendere gli hook

Il multisito è un argomento piuttosto avanzato. Prima di tentare una configurazione multisito, dedicati un po’ di tempo per impararli.

I modelli di Discourse utilizzano pups; le sue regole sono semplici e potenti.

Ogni regola che esegui può definire un hook:

run:
  exec:
    cd: some/path
    hook: my_hook
    cmd:
      - echo 1

Più avanti nel tuo container puoi inserire regole prima o dopo un hook:

hooks:
  before_my_hook:
    - exec: echo "I ran before"
  after_my_hook:
     - exec: echo "I ran after"

Quindi nell’esempio sopra vedrai un output simile al seguente:

I ran before
1
I ran after

Puoi leggere i modelli in /var/discourse/templates per vedere quali hook hai a disposizione.

Modificare il container standalone per fornire il tenant del secondo sito

Sostituisci l’intera sezione hooks con:

hooks:
  after_postgres:
     - exec: sudo -u postgres createdb b_discourse || exit 0
     - exec:
          stdin: |
            grant all privileges on database b_discourse to discourse;
          cmd: sudo -u postgres psql b_discourse
          raise_on_fail: false

     - exec: /bin/bash -c 'sudo -u postgres psql b_discourse <<< "alter schema public owner to discourse;"'
     - exec: /bin/bash -c 'sudo -u postgres psql b_discourse <<< "create extension if not exists hstore;"'
     - exec: /bin/bash -c 'sudo -u postgres psql b_discourse <<< "create extension if not exists pg_trgm;"'

  after_code:
    - exec:
        cd: $home/plugins
        cmd:
          - mkdir -p plugins
          - git clone https://github.com/discourse/docker_manager.git
  before_bundle_exec:
    - file:
        path: $home/config/multisite.yml
        contents: |
         secondsite:
           adapter: postgresql
           database: b_discourse
           pool: 25
           timeout: 5000
           host_names:
             - b.discourse.example.com

  after_bundle_exec:
    - exec: cd /var/www/discourse && sudo -H -E -u discourse bundle exec rake multisite:migrate

Ci sono 4 hook in gioco:

  1. after_postgres assicura che dopo l’installazione di postgres venga creato un db aggiuntivo chiamato b_discourse con i permessi appropriati e le estensioni richieste.

  2. after_code assicura che docker_manager venga clonato nella directory dei plugin.

  3. before_bundle_exec assicura che il file multisite.yml sia presente (che definisce dove trovare i database).

  4. after_bundle_exec esegue l’attività di migrazione db personalizzata rake multisite:migrate — questo assicura che tutti i db siano aggiornati.

Nota sulla configurazione

L’esempio sopra può essere suddiviso in container dati / container app, se necessario. Esegui semplicemente l’hook after_postgres nel container dati e il resto nel container web.

L’esempio sopra può essere esteso per fornire ancora più DB. Per farlo, fornisci più DB duplicando le chiamate di creazione db ecc., e assicurati di aggiungere siti aggiuntivi in multisite.yml.

Assicurati di modificare il nodo host_names in multisite.yml in modo che corrisponda al nome host effettivo che desideri ospitare.

Inoltre, se hai intenzione di eseguire HTTPS, avrai bisogno di un proxy davanti al sito per gestirlo, poiché la funzionalità letsencrypt integrata non funzionerà in uno scenario multisito.

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